Tweak markdown to properly render html

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carl 2019-09-20 14:12:41 +10:00
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@ -11,7 +11,7 @@ lang: it-it
Un'espressione regolare (regex o regexp in breve) è una speciale stringa
utilizzata per definire un pattern, ad esempio per cercare una sequenza di
caratteri; ad esempio, `/^[a-z]+:/` può essere usato per estrarre `http:`
dall'URL `http://github.com/`.
dall'URL `http://github.com/`.
PCRE (Perl Compatible Regular Expressions) è una libreria per i regex in C.
La sintassi utilizzata per le espressioni è molto simile a quella di Perl, da
@ -19,7 +19,9 @@ cui il nome. Si tratta di una delle sintassi più diffuse per la scrittura di
regex.
Esistono due tipi di metacaratteri (caratteri con una funzione speciale):
* Caratteri riconosciuti ovunque tranne che nelle parentesi quadre
```
\ carattere di escape
^ cerca all'inizio della stringa (o della riga, in modalità multiline)
@ -36,16 +38,17 @@ Esistono due tipi di metacaratteri (caratteri con una funzione speciale):
```
* Caratteri riconosciuti nelle parentesi quadre
```
\ carattere di escape
^ nega la classe se è il primo carattere
- indica una serie di caratteri
[ classe caratteri POSIX (se seguita dalla sintassi POSIX)
] termina la classe caratteri
```
```
PCRE fornisce inoltre delle classi di caratteri predefinite:
PCRE fornisce inoltre delle classi di caratteri predefinite:
```
\d cifra decimale
\D NON cifra decimale
@ -62,9 +65,11 @@ PCRE fornisce inoltre delle classi di caratteri predefinite:
## Esempi
Utilizzeremo la seguente stringa per i nostri test:
```
66.249.64.13 - - [18/Sep/2004:11:07:48 +1000] "GET /robots.txt HTTP/1.0" 200 468 "-" "Googlebot/2.1"
```
Si tratta di una riga di log del web server Apache.
| Regex | Risultato | Commento |

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@ -3,16 +3,18 @@ language: PCRE
filename: pcre.txt
contributors:
- ["Sachin Divekar", "http://github.com/ssd532"]
---
A regular expression (regex or regexp for short) is a special text string for describing a search pattern. e.g. to extract domain name from a string we can say `/^[a-z]+:/` and it will match `http:` from `http://github.com/`.
A regular expression (regex or regexp for short) is a special text string for describing a search pattern. e.g. to extract domain name from a string we can say `/^[a-z]+:/` and it will match `http:` from `http://github.com/`.
PCRE (Perl Compatible Regular Expressions) is a C library implementing regex. It was written in 1997 when Perl was the de-facto choice for complex text processing tasks. The syntax for patterns used in PCRE closely resembles Perl. PCRE syntax is being used in many big projects including PHP, Apache, R to name a few.
There are two different sets of metacharacters:
* Those that are recognized anywhere in the pattern except within square brackets
```
\ general escape character with several uses
^ assert start of string (or line, in multiline mode)
@ -32,18 +34,19 @@ There are two different sets of metacharacters:
```
* Those that are recognized within square brackets. Outside square brackets. They are also called as character classes.
```
\ general escape character
^ negate the class, but only if the first character
- indicates character range
[ POSIX character class (only if followed by POSIX syntax)
] terminates the character class
```
PCRE provides some generic character types, also called as character classes.
```
PCRE provides some generic character types, also called as character classes.
```
\d any decimal digit
\D any character that is not a decimal digit
@ -59,7 +62,13 @@ PCRE provides some generic character types, also called as character classes.
## Examples
We will test our examples on following string `66.249.64.13 - - [18/Sep/2004:11:07:48 +1000] "GET /robots.txt HTTP/1.0" 200 468 "-" "Googlebot/2.1"`. It is a standard Apache access log.
We will test our examples on the following string:
```
66.249.64.13 - - [18/Sep/2004:11:07:48 +1000] "GET /robots.txt HTTP/1.0" 200 468 "-" "Googlebot/2.1"
```
It is a standard Apache access log.
| Regex | Result | Comment |
| :---- | :-------------- | :------ |

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@ -13,7 +13,9 @@ lang: zh-tw
相容Perl正規表達式(Perl Compatible Regular Expressions, PCRE)是一個實作正規表達式的C語言函式庫此函式庫在1997年被開發出來在當時面對複雜字串處理時大多會選擇使用Perl也因為如此PCRE大多的正規表達式語法都很酷似PerlPCRE語法被廣泛運用在許多大專案中包括PHPApacheR等
PCRE中的超字元(metacharacter)主要可以分為以下兩類:
* 在中括號外會被辨識的字元
```
\ 通用跳脫字元
^ 字串開頭 行首
@ -33,18 +35,17 @@ PCRE中的超字元(metacharacter)主要可以分為以下兩類:
```
* 在中括號內會被辨識的超字元在中括號外會被視為字元集合使用
```
\ 通用跳脫字元
^ 非字元集合的字但只會抓到第一個符合的字元
- 字元範圍
[ POSIX字元集合(若後面接POSIX格式)
] 字元集合定義結束
```
```
PCRE提供了一些通用的字元類型可被當作字元集合使用
```
\d 任何數字字元
\D 任何非數字字元